Designs by the inventor of the Slotless
Wide Airgap Motor
This is a classical BH-Loop analog
test circuit. They are difficult to manage with any accuracy.
Several components must be changed to accomodate frequency changes.
Special amplifiers are required for anything other than line
frequencies. Signal generators do not have enough power output
to handle the primary circuit. The accuracy of a cathode ray
tube oscilloscope is insufficient for laboratory work. Even with
a digital scope, simple measurements become time consuming and
tedious producing marginal accuracy.
Cathode Ray Tubes have limited full
scale accuracy. Taking precision measurements from any scope
is not practical. Measurements are not much better than ±5%
even with a digital scope due to the A/D converters despite the
appearance on the screeen. Data must be collected and processed
by other means to achieve true laboratory grade measurements.
The scope becomes a visualization of a much more highly refined
Jackson Research is using specialized
wide band linear power amplifiers to drive primary circuits.
The output is captured by high resolution high bit rate A/D converters
and analyzed with proprietary DSP techniques to render precision
BH Loops with better than 1% accuracy from DC to 250KHz. Our
instruments also allow us to introduce precision DC offsets.